It's entirely different when the critic is a constructive one. Something like "your plot is too predictable," or "your ocs eyes are not on the same level" are fine, maybe not nice to receive but they help you to improve. However, things like "your story/ oc sucks" directed at you only to make you feeling hurt are devastating at times. You can see how stupid/ pointless are they, or that the person who wrote them is envious/et cet... yet, they still can hit to the core. No one likes their works to be hated.
Actually, I keep away from drama as much as I can, but sometimes, like now, it just finds me on its own xD All what I did was blocking these individuals, so they would not send me any notes again. Actually, I pity these people. They appear to be so possessive about a fictional charrie, that I can imagine their reaction when they encounter another OC, this time clearly paired up with him, ha ha